An adjustable backstay is a long wire running from the mast to the stern. This tool allows the crew to change the curve of the mast during flight. Tightening the wire flattens the sail to help the boat handle strong winds.
A sailor pulls the backstay adjuster to depower the mainsail during a sudden gust. This action prevents the boat from leaning too far over in the water. Loosening the wire creates a deeper sail shape for better speed in light winds.
Proper tension on this wire keeps the front forestay tight for better upwind steering. Mastering this control helps the team maintain a consistent speed in changing weather.
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